Torque Converter Lock/Unlock

[gabeyd]

2000 Excursion 7.3 Diesel, PHP Phoenix 40T, 80FS, 80DD

I was under the impression that Bill used PMT1 shift strategies, but I'm seeing my torque converter unlock as soon as I touch the brake. It just makes no since to me, and is one thing I have always disliked about my stock PCM.

I let my foot off the throttle to slow down, the engine does some braking, but it isn't quite enough, so I put my foot on the brake. Now the TC unlocks, and so the engine is no longer helping me slow down, so I have to brake harder. If I let off the brake, the TC re-locks, and the engine slows down again. I hate this.

I thought PMT1 shifts kept the converter locked when decelerating, even if touching the brake petal, at least down to a certain speed...

Why isn't my PHP chip doing this, on every setting, even on the 40T setting (though I have not towed with it yet, this is all tested with just the truck).

Thanks.